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UNITED STATES PATENT OFFICE.

CHARLES A. PERRY, OF NEW YORK, N. Y., ASSIGNOB TO G. W. RADER & (30., OF SAME PLACE.

lNVERT-BLQCK FOR SEWER-BOTTOMS.

SPECIFICATION forming part of Letters Patent No. 236,840, dated January 18, 1881.

To all whom it may concern:

Be it known that I, OHARLEs A. PERRY, of New York, in the county and State of New York, have invented a new and Improved Invert-Block for Bottoms of Sewers, of which the following is. a specification.

Figure 1 is a perspective view, partly in section, of a sewer having my improved invert-block. Fig. 2' is a longitudinal vertical section of two adjoining invert-blocks made according to my invention. Fig. 3 is a detail perspective view of the old style of invertblock.

This invention relates to improvements on hollow invert-blocks used in forming the bottoms of sewers, and a passage below for subdrainage. These invert-blocks have heretofore been usually made as shown in Fig. iii-that is to say, hollow longitudinally and with plain upright abuttingends. Where two such blocks abut, the joint was closed by cement in line with the upper surface of the blocks, (from c to f, Fig.3,) but not along the vertical sides and bottom, so as to leave au open joint for allowing spring-water and other water in the earth to percolate and flow along in the sub-drain. The difficult-y with these blocks is, that the cement along the upper surface, being improperly supported at the joint, is apt to be worn away, or otherwise to open the joint below, thereby letting the sewage-matter through into the sub-drain, and thence through the aforementioned open joints into the soil, rendering the latter foul and unhealthy and defeating the principal object of the sewer.

My invention is intended to remedy. this defect, and maintain at the same time the beneficial function of the hollow invert-block; and it consists, principally, in notching or cutting out each block at the upper surface at each end and fitting into the recess thus formed by two abutting blocks, or placing upon said blocks a joint-breaking plate, which is thoroughly cemented at the bottom and at the ends, thus rendering the displacement of Application filed December 9, 1880.

(N0 model.)

the cement and the opening of the top joint practically impossible.

A B in the drawings are abutting hollow invert-blocks of my invention. Each has its top recessed orcut away at each end to the length of one or two inches, more or less, as shown at a. The recess or transverse groove thus formed on top, wherever two blocks abut, receives, first, a bed of cement, and into the cement,while fresh, is then tightly fitted aplate, O, which, together with the cement, fills said recess or groove. The said plate 0, together with the cement, when set, renders the bottom of the sewer practically smooth and free of obstructions. As this plate 0 and its lining of cement breaks joint with the invert-blocks, the proper closing of the top joint between the blocks is insured.

The recesses 00 may, if desired, be extended so that each block will practically be covered by two halves or parts of two abutting top plates, 0, that break joint with said blocks. The top of each invert-block and that of each plate 0 may either be concave or flat, as may be desired.

The joints at b and d between the invertblocks remain open to admit spring and other water into the sub-drain.

I claim 1. In combination with the hollow abutting invert-blocks A B, the top plates, 0 0, set in cement and arranged to break joints with said blocks, and to close the joints between two such blocks at the top, leaving said joints open below the top of the blocks, substantially as specified.

2. The hollow invert-blocks A B, having recesses a a, in combination with the plates (J, placed into said recesses, substantially as herein shown and described.

CHAS. A. PERRY.

Witnesses:

WILLY G. E. SCHULTZ, WILLIAM H. 0. SMITH. 

